Furnace for steam-generators



(No Model.)

- G. E. PALMER & A. M EWART.

FURNACE FOR STEAM GENERATORS.-

No. 349,737. Patented Sept. 28,1886.

UNITED ST T S 1 PAT T OFFICE.

GEORGE E. PALMER AND AROHIBALD M. EWART, OF CHICAGO, ILLINOIS.

F URNA CE FOR STEAM-GENERATORS.

. .SPECIPICATION forming part of Letters Patent No. 349,737, datedSeptember 28, 1886.

Application filed July 29, 1886. Serial No. 209,384. (No model.)

To all whom it may concern:

Be it known that we, GEORGE E. PALMER and AROHIBALD M. EWART, citizensof the United States, residing at Chicago, in the county of Cook andState of Illinois, have invented a new and useful Improvement inFurnaces for Steam-Generators, of which the following is aspecification.

Our invention relates to furnaces for steamgenerators; and its object isto so construct; the furnace as to derive the maximum'advantage from thefuel employed, which object we aim to accomplish by the constructionillustrated in the accompanying drawings and described hereinafter.

Referring to the drawings, in which like parts are indicated bylikeletters, Figure lis a longitudinal section of a furnace embodyingour invention, and a small portion of a sectionalgenerator; and Fig. 2is a cross-section of the same furnace and generator, or a section atright angles to Fig. 1.

In carrying out our invention we so construct the roof of the furnace asto cause the gases generated from the ignited fuel to be retarded intheir passage to the heating-tubes, the effect of which is to produce anagitation and blending of the combustive gases and the oxygen whichmaintains the combustion. The construction is such as to cause the gasesof combustion, when passing to such heatingfnrnace, to impingeagainstthe roof of the fur nace, and their escape being retarded theyare sufficiently heated to accomplish the complete decomposition of suchportions of the fuel as can reach the extreme point of oxidation only ata high temperature.

The features of novelty for which we desire protection are pointed outin the claims at the end of thisdescription.

In the drawings, Aindicates the outer walls of the furnace, B a tubularboiler in position over the furnace, O the furnace-grate, and D theash-pit. These parts are of the usual construction. The interior of thefurnace has its walls so constructed that they gradually approach eachother toward the center, thus producing a conformation somewhatresembling the arch of a building, the inner end of the arch being on alower plane than the top line of its front, and the center of the archcapped by fire-brick, as shown.

The letter a indicates the interior walls of the arch, which from thepoints a: w are built outward and upward in such a manner as to formoffsets, as shown. From the points x 00 the walls to extend backward andupward, with offsets to the main wall of the furnace. Theinwardly-projecting points y y of this wall are covered by the brickslabs b, the edges of which overlap in such a manner as to form stepsrising from the rear to the front of the arch, thus causing the outletof the arch formed by the inwardly-projecting walls to open upon a lowerplane than the plane occupied by the top line of the front of the arch.The arrangement of the slabs I) in the manner explained provides aseries of offsets on-the under surface of the arch, as clearly shown inFig. 1 of the drawings.

\Vithin this peculiarly-constructed furnace the combustion is intendedto be thoroughly effected, and the retardation of the products ofcombustion, due to the construction described, causes the gases to pressor impinge against the walls and caps of the arch on their way to theheating-tubes, and during their passage thereto the gases which theycontain are thoroughly intermingled with the oxygen that is admitted tosupport combustion, and thus are extracted the maximum heating qualitiesof the fuel. This form of arch is also found to render the walls moresusceptible to the absorbing and communicating of the heat of the fuel,and the radiation of heat against the boiler-walls is obviated, thuspreventing the fire-gases from cooling down before the degree of heatnecessary to a complete decomposition of the same is reached, the gasesin their most advantageous condition being thus brought in contact withthe effective heatingsurface.

-Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-- v 1. A steam-generator furnacethe interior walls whereof approach each other in the form of an arch,the surface of the walls of said 3. The inwardly-projecting wallsprovided with offsets, as explained, combined with the archbeingconstructed to forni a series of offsets, whereby the escape of theproducts of combustion is retarded and a more intimate blending of thecombustive gases is efl'ected, substantially as set forth.

other, substantially as and for the purpose set forth.

GEO. E. PALMER. AROHIBALD M. EVVART.

\Vitnesses:

QUIDA J. CHoTT, MILToN THOMAS.

cap-slabs, the edges of which overlap one an- 15

